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After Boston Marathon explosions, pictures and prayers spread on Twitter

Two bombs exploded near the Boston Marathon finish line on Monday, according to the event’s Facebook page. The New York Times said
the explosions occurred about four hours after the men's race began.
Twenty people are injured and two are dead, the Boston Police Department
tweeted.

The AP reported that cellphone service in Boston has been shut down "to prevent any potential remote detonations of explosives."

The Boston Police Department's official Twiiter account is keeping the public informed of press conferences, casualty counts and more.

People who ran the race have taken to social media to share that they’re
all right. Twitter has also became a place for people to post their
prayers and well wishes, as well as dramatic pictures from the scene.

At a Monday afternoon press conference, Boston Police Commissioner Ed
Davis warned people to stay home and avoid congregating in large crowds.

“People should be calm, but they should understand that this is an ongoing event,” he said.

Davis said people running from the explosions along the marathon
route dropped a number of parcels and bags, all of which were “being
treated as a suspicious device.” He also confirmed that a third
explosion at the John F. Kennedy Presidential Library & Museum
happened shortly after 3 p.m. Eastern time.

“We’re investigating all leads right now,” he said.

The police had not found any more devices along the marathon
route, even though they performed a controlled explosion of a bag.
Authorities were also not looking for a specific type of truck, he said.
Davis asked anyone with information about the bombings to call
1-800-494-TIPS.

He said there were no prior warnings of the attack, and when
asked whether the bombings were an act of terrorism, Davis said, “You
can reach your own conclusions.”